61202.086L1-1 ISU 512 User Manual 7Chapter 2Ordering ISDNISDN is a complex service with many network options. Obtaining servicefrom the local telephone company and long distance providers can be compli-cated.The following instructions only apply to North American switches.In North America, the development of ISDN Ordering Codes (IOCs) simplifiesthe process of ordering ISDN service. The ISDN Solutions Group, a consor-tium of ISDN equipment vendors, service providers, and Bellcore, establishedthese codes to represent predetermined line configurations for ISDN BasicRate service for specific applications.ADTRAN and Bellcore have registered and tested eight generic IOCs. TheseIOCs are supported by all major local exchange carriers as well as several in-dependent carriers.Capability S (previously Generic Data M) ordering code is recommended forISU 512 applications. It is the most feature-rich and supports most voice anddata applications. The voice capability is not necessary for operation of theISU 512; however it is useful in troubleshooting a misconfigured ISDN line. Insome areas, ISDN tariffs may warrant the use of ordering codes with less fea-tures. For example, in a particular region, there may be additional monthly ex-pense associated with having voice service on each B channel. If you have adata only application Capability R (previously Generic Data I) may be morecost-effective. Each ISDN line provides 112/128 kbps of service. If 512 kbps isneeded for your application, order four ISDN lines. If 384 kbps is needed, onlyorder three ISDN lines, etc.
